Gli抑制剂GANT61对肺癌细胞生长的抑制作用

目的 研究GANT61对人肺癌细胞H1703和A549生长抑制作用,并探讨其作用机制。方 法 培养H1703和A549细胞,加入不同浓度GANT61 72 h后MTS法检测药物对细胞生长的抑制率;Western blot法观察GANT61作用于H1703和A549细胞后对Gli1和Gli2蛋白表达的影响。Transwell侵袭实验观察GANT61作用于H1703和A549细胞后对侵袭能力的影响。结果 MTS显示GANT61作用于H1703和A549的IC50值分别是8.6 μmol/L和8.2 μmol/L,GANT61对H1703和A549细胞有明显的生长抑制作用并且呈剂量依赖性。Western blot显示GANT61可显著下调H1703和A549细胞Gli1和Gli2蛋白的表达。Transwell侵袭实验显示GANT61处理组H1703和A549细胞的侵袭能力均明显下降。结论 GANT61可以明显抑制H1703和A549的细胞活力和侵袭能力,这表明Hedgehog通路的Gli1和Gli2在肺癌的发生和发展中起着重要作用,Gli有望成为新的抗肿瘤靶点。     

Shh和Gli-1在人乳腺癌MCF-7耐药细胞株中的表达及意义

目的 研究Shh和Gli-1在人乳腺癌耐药株中的表达情况,探讨Hedgehog信号通路与乳腺癌耐药的关系。方法 高浓度间歇诱导法建立人乳腺癌耐药细胞株MCF-7／PTX,MTT法检测紫杉醇（PTX）对MCF-7与MCF-7／PTX细胞的半数抑制浓度（IC50）。实时定量PCR（QPCR）检测MCF-7、MCF-7／PTX细胞中Shh、Gli-1 mRNA的表达。Western blotting检测MCF-7、MCF-7／PTX细胞中Shh、Gli-1蛋白的表达。结果 PTX 对 MCF-7细胞的IC50为（0.10±0.02）mg／L,对 MCF-7／PTX细胞的 IC50为（5.30±0.01）mg／L;耐药指数为53.0。Shh mRNA在MCF-7、MCF-7／PTX细胞中的表达量分别为0.78±0.12和1.45±0.56（P＜0.01）;Gli-1 mRNA在MCF-7、MCF-7／PTX细胞中的表达量分别为1.86±0.02和3.56±0.26（P＜0.01）。Shh 蛋白在MCF-7、MCF-7／PTX细胞中的表达量分别为0.58±0.06和1.03±0.22（P＜0.01）;Gli-1 蛋白在MCF-7、MCF-7／PTX细胞中的表达量分别为1.17±0.12和2.78±0.09（P＜0.01）。结论 人乳腺癌耐药细胞株MCF-7／PTX高表达Shh、Gli-1,化疗药物可能通过上调Hedgehog信号通路相关蛋白及基因介导乳腺癌耐药,针对该信号通路的靶向治疗将是克服乳腺癌耐药的一个新的选择。     

Gli-1 siRNA induced apoptosis in Huh7 cells

AIM： To investigate the effects of Gli-1 small interference RNA （siRNA） on Huh7 cells, and the change of Bcl-2 expression in Huh7 cells. METHODS： Human hepatocellular carcinoma cells Huh7 were used. Cell viability was analyzed by 3-（4, 5-Dimethylthiazol-2-yl）-2, 5-diphenyl tetrazolium bromide （MTT） assay. The expressions of Gli-1 and Bcl-2 family members were detected by RT-PCR and Western blot. Apoptosis was detected by Flow cytometry using propidium iodide, measured by Hoechst 33258 staining using Advanced Fluorescence Microscopy and caspase-3 enzymatic assay. Cell growth was analyzed after treatment with Gli-1 siRNA and 5-fluorouracil （5-Fu）. RESULTS： Inhibition of Gli-1 mRNA in Huh7 cells through Gli-1 siRNA reduced cell viability. Gli-1 siRNA treatment also induced apoptosis by three criteria, increase in the sub-G1 cell cycle fraction, nuclear condensation, a morphologic change typical of apoptosis, and activation of caspase-3. Gli-1 siRNA was also able to down-regulate Bcl-2. However, Gli-1 siRNA resulted in no significant changes in Bcl-xl, Bax, Bad, and Bid. Furthermore, Gli-1 siRNA increased the cytotoxic effect of 5-Fu on Huh7 cell. CONCLUSION： Down-regulation of Bcl-2 plays an important role in apoptosis induced by Gli-1 siRNA in HCC cells. Combination Gli-1 siRNA with chemotherapeutic drug could represent a more promising strategy against HCC. The effects of the strategies need further investigation in vivo and may have potential clinical application.